English to Arabic Other Education / Pedagogy grades

Dear all,

كيف نميز 0ر4 في السياق التالي؟

"You’re the valedictorian. You have a 4.0.

** the script explained "4.0" as follows:

4.0 grade point average, the highest score a student can earn, indicating a flawless academic record)

كيف نميز هذا الرقم؟؟

Thanks a lot.